EP2476951A1 - Rückbeleuchtungsscanner und Flüssigkristallanzeigevorrichtung damit - Google Patents

Rückbeleuchtungsscanner und Flüssigkristallanzeigevorrichtung damit Download PDF

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Publication number
EP2476951A1
EP2476951A1 EP11187396A EP11187396A EP2476951A1 EP 2476951 A1 EP2476951 A1 EP 2476951A1 EP 11187396 A EP11187396 A EP 11187396A EP 11187396 A EP11187396 A EP 11187396A EP 2476951 A1 EP2476951 A1 EP 2476951A1
Authority
EP
European Patent Office
Prior art keywords
light
light source
unit
guiding plate
source unit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP11187396A
Other languages
English (en)
French (fr)
Inventor
Dae-Hee Lee
Hyeong-Sik Choi
Myung-Ryul Jung
Do-Hyeon Baek
Sin-wook Hyung
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Samsung Electronics Co Ltd
Original Assignee
Samsung Electronics Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Samsung Electronics Co Ltd filed Critical Samsung Electronics Co Ltd
Publication of EP2476951A1 publication Critical patent/EP2476951A1/de
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/003—Lens or lenticular sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0036—2-D arrangement of prisms, protrusions, indentations or roughened surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
    • G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133524—Light-guides, e.g. fibre-optic bundles, louvered or jalousie light-guides
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side

Definitions

  • Apparatuses and methods consistent with exemplary embodiments relate to a backlight unit used in a liquid crystal display, and more particularly, to a scanning backlight unit.
  • a liquid crystal display is a display apparatus and is widely used owing to its property of reducing weight, miniaturization, full color, and high resolution.
  • a liquid crystal panel which is used in the liquid crystal display reveals images by using a liquid crystal and a light receiving element, which is unable to emit light by itself. Accordingly, a backlight unit which supplies the light to the liquid crystal panel is required.
  • the backlight unit may be classified into an edge-lit backlight unit which requires a light guiding plate and a direct-lit backlight unit which does not require a light guiding plate.
  • the edge-lit backlight unit for which the light source is mounted at one side of the light guiding plate may thin the liquid crystal display and thus is widely used recently.
  • the backlight unit is activated in a hold type which keeps the on-state at all times.
  • motion blur may occur when the liquid crystal display replays the video images.
  • a scanning backlight technique has been disclosed as one of the methods to prevent motion blur
  • the backlight unit which is applied to the scanning backlight technique is calls as a scanning backlight unit.
  • the backlight unit is divided into plural sections and each section repeats an on state (i.e., a state of supplying the light to the liquid crystal panel) and an off state (i.e., a state of not supplying the light to the liquid crystal panel) consecutively.
  • the first section of the backlight unit may be in an on state and the remaining sections of the backlight unit may be in an off state and, in the next time, the second section of the backlight unit may be in an on state and the remaining sections of the backlight may be in an off state.
  • the first section of the backlight unit is in an on state, it is preferable that only the first section of the backlight unit supplies the light to the liquid crystal panel and the remaining sections of the backlight unit should not supply the light to the liquid crystal panel.
  • the light in the first section of the backlight unit is spread to the other section of the backlight unit due to the dispersion phenomenon in the light guiding plate. Accordingly, the other section of the backlight unit partially supplies the light to the liquid crystal panel. In this case, crosstalk may occur on the images which are reproduced by the liquid crystal display. Therefore, a technique which may prevent such crosstalk is needed.
  • Exemplary embodiments of the present inventive concept address at least the above problems and/or disadvantages and other disadvantages not described above. Also, the present invention is not required to overcome the disadvantages described above, and an exemplary embodiment of the present invention may not overcome any of the problems described above.
  • a scanning backlight unit which may include: a first light source unit having plural groups of first light sources which generate light independently; a control unit which controls the plural groups of the first light sources; and a light guiding plate which transmits the light generated from the first light source unit to a liquid crystal panel, wherein the light guiding plate comprises a first side which receives the light generated by the first light source unit, a bottom surface which is formed with a dispersion pattern dispersing the light received from the first side, and a top surface which transmits the light towards the liquid crystal panel, wherein the top surface of the light guiding plate comprises a lenticular lens having a length which is parallel to a main incidence direction of the light generated by the first light source unit, wherein the dispersion pattern comprises a plurality of grooves, with a groove of the plurality of grooves having a shape with a first size which is parallel to the main incidence direction of the first light source unit and a second size which is perpendicular to the main
  • a ratio of a depth of the groove to the second size of the groove may be at least 0.8.
  • a depth of the groove may be at least 90 ⁇ m.
  • a portion of the groove may be in an oval shape having a major axis parallel to the main incidence direction of the first light source unit and a minor axis perpendicular to the main incidence direction of the first light source unit.
  • the first light sources of the first light source unit may include a first plurality of light emitting diodes.
  • a length of the first side of the light guiding plate may be shorter than a length of a second side of the light guiding plate adjacent to the first side.
  • a distribution density of grooves among the plurality of grooves may increase with distance from the first light source unit.
  • the groove may be formed by a laser.
  • the backlight unit may further include a second light source unit, which is at an opposite side of the first light source unit, and which has plural groups of second light sources which generate light independently.
  • the second light source unit may include a second plurality of light emitting diodes.
  • a distribution density of grooves among the plurality of grooves may increase with distance from the first light source unit and the second light source unit.
  • a liquid crystal display which may include a scanning backlight unit including: a first light source unit having plural groups of first light sources which generate light independently; a control unit which controls the plural groups of the first light sources; and a light guiding plate which transmits the light generated from the first light source unit to a liquid crystal panel, wherein the light guiding plate comprises a first side which receives the light generated by the first light source unit, a bottom surface which is formed with a dispersion pattern dispersing the light received from the first side, and a top surface which transmits the light towards the liquid crystal panel, wherein the top surface of the light guiding plate comprises a lenticular lens having a length which is parallel to a main incidence direction of the light generated by the first light source unit, wherein the dispersion pattern comprises a plurality of grooves, with a groove of the plurality of grooves having a shape with a first size which is parallel to the main incidence direction of the first light source unit and a second size which is per
  • a television which may include a liquid crystal display which may include a scanning backlight unit including: a first light source unit having plural groups of first light sources which generate light independently; a control unit which controls the plural groups of the first light sources; and a light guiding plate which transmits the light generated from the first light source unit to a liquid crystal panel, wherein the light guiding plate comprises a first side which receives the light generated by the first light source unit, a bottom surface which is formed with a dispersion pattern dispersing the light received from the first side, and a top surface which transmits the light towards the liquid crystal panel, wherein the top surface of the light guiding plate comprises a lenticular lens having a length which is parallel to a main incidence direction of the light generated by the first light source unit, wherein the dispersion pattern comprises a plurality of grooves, with a groove of the plurality of grooves having a shape with a first size which is parallel to the main incidence direction of the first light source unit and
  • a scanning backlight unit which may include: a light source unit having plural light sources which emit light in a main incidence direction; a control unit which controls the plural groups of light sources; and a light guiding plate having a bottom surface formed with a dispersion pattern dispersing the light received from the light source unit, wherein the dispersion pattern comprises a plurality of grooves, and each groove among the plurality of grooves has a ratio of depth to width of 0.8 or more.
  • a distribution density of grooves among the plurality of grooves increases with distance from a first light source unit from among the plurality of light source unit toward a center of the liquid crystal panel.
  • a scanning backlight unit which may include: a light source unit having plural groups of light sources which emit light in a main incidence direction; a control unit which controls the plural groups of light sources; and a light guiding plate having a bottom surface formed with a dispersion pattern dispersing the light received from the light source unit, wherein the dispersion pattern includes a plurality of grooves, with a groove of the plurality of grooves having a shape with a first size parallel to the main incidence direction and a second size perpendicular to the main incidence direction, and wherein the first size is larger than the second size.
  • Each groove among the plurality of grooves may have a ratio of depth to width of 0.8 or more.
  • FIG. 1 is a schematically exploded perspective view of a liquid crystal display according to an exemplary embodiment.
  • the liquid crystal display 1 may include a front case 10, a liquid crystal panel 20, and a scanning backlight unit 100.
  • the front case 10 forms an appearance of the liquid crystal display 1 in combination with the scanning backlight unit 100.
  • the liquid crystal panel 20 displays images by receiving the light from the scanning backlight unit 100. As those skilled in the art may easily understand the specific structure of the liquid crystal panel 20, its detailed description is omitted.
  • the scanning backlight unit 100 supplies the light to the liquid crystal panel 20 and may include first and second light source units 110 and 120, a light guiding plate 130, a reflected sheet 140, an optical sheet 150, and a frame 160.
  • the first and second light source units 110 and 120 generate light by receiving power from the power source (not shown).
  • the light guiding plate 130 supplies the light which is generated by the first and second light source units 110 and 120 to liquid crystal panel 20.
  • the light guiding plate 130 is a flat plate shaped member which keeps an even thickness and may be composed of a transparent acrylic material, a polymethylmethacrylate (PMMA), a plastic, or a glass etc.
  • the reflected sheet 140 is placed under the light guiding plate 130 and reflects the light which is projected downwards the light guiding plate 130 to the liquid crystal panel 20.
  • the optical sheet 150 is placed above the light guiding plate 130 and diffuses and concentrates the light which heads towards the liquid crystal panel 20.
  • the optical sheet 50 may be composed of a diffusion sheet and a prism sheet.
  • the frame 160 accommodates components of the scanning backlight unit 100 such as the first and second light source units 110 and 120, the light guiding plate 130, the reflected sheet 140, and the optical sheet 150.
  • first and second light source units 110 and 120 and the light guiding plate 130 are presented with reference to FIGS. 2 to 5 .
  • FIG. 2 schematically shows a disposition of the first and second light source units 110 and 120 and the light guiding plate 130.
  • FIG. 3 schematically shows a perspective view of the light guiding plate 130.
  • FIG. 4 shows a part of the bottom of the light guiding plate 130.
  • FIG. 5 shows an enlarged groove which is formed at a bottom surface of the light guiding plate 130.
  • the first light source unit 110 includes plural first light emitting diodes 111 a, 111b and 111n and a first circuit board 112 on which the plural light emitting diodes 111 a, 111b, and 111n are installed.
  • the second light source unit 120 includes plural second light emitting diodes 121 a, 121 b, and 121 n and a second circuit board 122 on which the plural light emitting diodes 121 a, 121 b, and 121 n are installed.
  • the first light source unit 110 is placed in front of a first side 131a of the light guiding plate 130.
  • the light generated by the first light source unit 110 is projected to the first side 131 a of the light guiding plate 130 along the main incidence direction X1.
  • the second light source unit 120 is placed in front of a second side 131 b which is located at an opposite side of the first side 131 a of the light guiding plate 130.
  • the light generated by the second light source unit 120 is projected to the second side 131b b of the light guiding plate 130 along the main incidence direction X2.
  • the first and second light source 110 and 120 are drawn as if it is placed apart from the first and second sides 131 a and 131 b of the light guiding plate 130, however, it is required to notice that the first and second light source 110 and 120 are actually placed nearby the first and second side 131 a and 131 b of the light guiding plate 130.
  • the scanning backlight unit 100 may thin the liquid crystal display 1 as the first and second light source units 110 and 120 are embodied by the edge-lit backlight units placed at the first and second sides 131a and 131 b of the light guiding plate.
  • Third and fourth sides 131c and 131d which are adjacent to the first and second sides 131a a and 131b of the light guiding plate 130 are not mounted with the light source units.
  • only the first and second light source units 110 and 120 are mounted closely to the first and second sides 131 a and 131 b which are relatively short in length among the four sides 131a-131d of the light guiding plate 130. Therefore, the size of the liquid crystal display may be reduced even more.
  • the distance between the first and second sides 131 a and 131 b of the light guiding plate 130 is called as the length of the light guiding plate 130
  • the distance between the third and fourth sides 131c and 131d of the light guiding plate 130 is called as the height of the light guiding plate 130.
  • the first and second light source units 110 and 120 are separated into plural groups which may be operated 11 ently.
  • a control unit 170 controls the operation of each group of the first and second light source units 110 and 120. By the control unit 170, each group of the first and second light source units 110 and 120 may generate the light independently. For example, if the first group of the first and second light source units 110 and 120 of the control unit 170 is activated and other groups are deactivated, only the light emitting diodes 111 a and 121 a relevant to the first group of the first and second light source units 110 and 120 generate the light and the light emitting diodes 111b, 111n, 121 b and 121 n relevant to the other groups of the first and second light source units 110 and 120 do not operate.
  • the control unit 170 activates the second group of the first and second light source units 110 and 120 of the control unit 170 and deactivates the other groups, only the light emitting diodes 111b and 121 b relevant to the second group of the first and second light source units 110 and 120 generate the light and the light emitting diodes 111 a, 111 n, 121 a and 121 n relevant to the other groups of the first and second light source units 110 and 120 do not operate. In this case, only the second section of the light guiding plate 130 supplies the light to the liquid crystal panel 20.
  • control unit 170 may embody a scanning operation. By this way, the motion blur which may occur during the reproduction of the video images may be prevented. As those skilled in the art may understand easily about the specific operation ways of the control unit 170 to embody the scanning operation, the detailed description thereof is omitted.
  • FIG. 2 three light emitting diodes are allotted to each group of the first and second light source units 110 and 120, however, it has to be understood that it only aims to clarify the drawings. Substantially, the number of the light emitting diodes which is allotted to each group of the first and second light source units 110 and 120 is more than the above.
  • the first group of the first and second light source units 110 and 120 When the first group of the first and second light source units 110 and 120 is activated, it is ideal that only the first section of the light guiding plate 130 supplies the light to the liquid crystal panel 20. However, practically, due to the dispersion phenomenon in the light guiding plate 130, the light generated by the light emitting diodes 111a and 121a relevant to the first group of the first and second light source units 110 and 120 is partially spread to the other sections of the light guiding plate 130. As a result, other than the first section of the light guiding plate 130 also supplies few light to the liquid crystal panel 20. This kind of phenomenon occurs equally even if the other groups instead of the first group of the first and second light source units 110 and 120 are activated. Therefore, on the images which are reproduced by the liquid crystal display 1, crosstalk may occur. To prevent this, it is desirable to improve the straightness of the incidence light towards the first and second sides 131 a and 131 b of the light guiding plate 130.
  • the top surface 135 of the light guiding plate 130 is formed with a lenticular lens 135a.
  • the lenticular lens 135a may improve the straightness of the incidence light towards the first and second sides 131a and 131 b of the light guiding plate 130 because a length of the lenticular lens 135a is formed in parallel to the main incidence direction X1 of the first light source 110 and the main incidence direction X2 of the second light source 120.
  • the first and second sides 131a and 131b of the lenticular lens 135a are perpendicular to the main incidence direction X1 of the first light source 110 and the main incidence direction X2 of the second light source 120, however, a length of the lenticular lens 135a is parallel to the main incidence direction X1 of the first light source 110 and the main incidence direction X2 of the second light source 120.
  • crosstalk which may occur during the scanning operation of the scanning backlight unit 100 may be prevented.
  • a dispersion pattern 137 is formed as shown in FIG. 4 .
  • the incidence light towards the first and second sides 131 a and 131 b of the light guiding plate 130 is dispersed by the dispersion pattern 137 and passes through the top surface 135 of the light guiding plate 130, and then passes to the liquid crystal panel 20.
  • the dispersion pattern 137 includes plural grooves 138.
  • the plural grooves 138 may be formed by laser engraving. A three-dimensional figure of any one among the plural grooves 138 is shown in FIG. 5 .
  • the distribution density of the groove 138 is substantially varied according to the position on the bottom surface 136 of the light guiding plate 130.
  • the distribution density of the groove 138 is increased as the groove recedes from the first and second light source units 110 and 120. That is, in a position near the first and second sides 131a and 131b of the light guiding plate 130, the distribution density of the grooves 138 is low and in the central part of the light guiding plate 130, the distribution density of the grooves 138 is high.
  • the reason why the distribution density of the groove 138 is altered is to embody a constant illumination along the length direction of the light guiding plate 130.
  • the amount of the incidence light from the first and second sides 131 a and 131 b of the light guiding plate 130 to the central part of the light guiding plate 130 is small, the amount of the emitting light from the central part of the light guiding plate 130 to the top surface of the light guiding plate 130 is reduced. As a result, if the distribution density of the groove 138 is maintained evenly, the illumination nearby the first and second sides 131 a and 131b of the light guiding plate 130 becomes higher than the illumination at the central part of the light guiding plate 130.
  • the distribution density of the groove 138 which causes the dispersion at the central part of the light guiding plate 130 is raised, it may increase the amount of the light discharging from the central part of the light guiding plate 130 towards the top surface 135. With this, a steady illumination may be maintained along the length direction of the light guiding plate 130.
  • the plural grooves 138 are formed at length along the main incidence directions X1 and X2 of the first and second light source units 110 and 120.
  • the plural grooves 138 have a first size (L) in a direction parallel to the main incidence directions X1 and X2 of the first and second light source units 110 and 120 and a second size (W) in a direction perpendicular to the main incidence direction X1 and X2 of the first and second light source units 110 and 120.
  • the first size (L) is larger than the second size (W).
  • the first size (L) represents a length of the groove
  • the second size (W) represents a width of the groove.
  • the grooves 138 are formed at length along the main incidence direction X1 and X2 of the first and second light source units 110 and 120, a straightness of the light incident towards the first and second sides 131 a and 131 b of the light guiding plate 130 and may prevent crosstalk which may occur during a scanning operation of the scanning backlight unit 100.
  • the exposed surface of the groove 138 has an oval shape. That is, the major axis of the oval is parallel to the main incidence direction X1 and X2 of the first and second light source units 110 and 120 and the minor axis of the oval is perpendicular to the main incidence direction X1 and X2 of the first and second light source units 110 and 120.
  • this is merely an example, and if the grooves 138 may be formed at length along the main incidence direction X1 and X2 of the first and second light source units 110 and 120, the shape of the exposed surface of the grooves may be variously changed.
  • a section (A) may occur where no grooves 138 are formed along the perpendicular direction against the main incidence of the first and second light source units 110 and 120.
  • the illumination of the scanning backlight unit 100 may be deteriorated. In an exemplary embodiment, this may be resolved by adjusting the shape of the grooves 138.
  • the depth (D) of the grooves 138 affects the illumination of the scanning backlight unit 100. That is, as the depth (D) of the groove 138 becomes deeper, the illumination of the scanning backlight unit 100 is increased.
  • W represents the width of the grooves 138
  • D represents the depth of the grooves 138.
  • the plural grooves 138 are formed at length along a direction perpendicular to the main incidence direction X1 and X2 of the first and second light source units 110 and 120.
  • the decreasing rate of the illumination of each case represents how much the illumination of each case is reduced compared to the illumination of the standard case.
  • the scanning efficiency represents how much the brightness of an area nearby this specific section is reduced compared to the brightness of the specific section which remains in an on state when only the specific section of the light guiding plate 130 remains on state. This means that as the scanning efficiency becomes higher, the straightness of the incidence light to the first and second sides 131 a and 131 b of the light guiding plate 130 gets better.
  • the depth (D) of the groove 138 exceeds 90 ⁇ m or more, the illumination decreasing hardly occurs compared to the standard case. If the depth (D) of the groove 138 is less than 90 ⁇ m, the illumination decreasing occurs. Accordingly, it is desirable to keep the depth (D) of the groove 138 to be 90 ⁇ m at least.
  • case 2 it is noticed in case 2 that the width (W) of the groove 138 is reduced compared to case 1, and the scanning efficiency of case 2 is higher than the scanning efficiency of case 1. Accordingly, in case 2, crosstalk which may occur during the scanning operation of the scanning backlight unit 100 may be refrained considerably.
  • the width (W) of the groove 138 influences the scanning efficiency. That is, as the width (W) of the groove 138 gets narrower, the light spreading phenomenon from a specific section of the light guiding plate 130 towards adjacent to the other section becomes restrained. With reference to FIG. 6 , the above is described in more detail.
  • FIG. 6 illustrates a graph showing a relative ratio of the brightness measured at each section of the light guiding plate 130 when the first group of the first and second light source units 110 and 120 is activated.
  • the brightness is measured from the central portion of the light guiding plate 130.
  • the horizontal axis represents a section of the light guiding plate 130 and the vertical axis represents a relative ratio of the brightness.
  • the relative ratio of the brightness means a value that divides the brightness measured from each section of the light guiding plate 130 by the brightness measured from the first section of the light guiding plate 130.
  • the light guiding plate 130 is divided into 7 sections. However, this is merely an example. It should be understood that the light guiding plate 130 may be divided in various ways.
  • the depth (D) of the groove 138 affects the illumination
  • the width (W) of the groove 138 affects the straightness of the light or the scanning efficiency. If a ratio of the depth (D) of the groove 138 in relation to the width (W) of the groove 138 is 0.8 or more, both the illumination and the scanning efficiency of the scanning backlight unit 100 may reach a satisfactory level. This means that crosstalk occurrence may be controlled without reducing the illumination of the scanning backlight unit 100.
  • the width (W) and the depth (D) of the groove 138 may be altered depending on the position at the bottom surface 136 of the groove 138. That is, the distribution density of the groove 138 is altered according to the position at the bottom surface 136 of the light guiding plate 130, and similarly, the illumination and the scanning efficiency of the scanning backlight unit 100 may be optimized by modulating the width (W) and the depth (D) of the groove 138.
  • FIG. 7 illustrates a graph showing a measured result of an illumination of the scanning backlight unit 100 according to an alteration of the depth (D) of the groove 138 in relation to the light guiding plate 130 having a different thickness.
  • the influence of the depth (D) of the groove 138 on the illumination of the scanning backlight unit 100 is not changed much. That is, regardless of the thickness difference of the light guiding plate 130, as the depth (D) of the groove 138 becomes deeper, the illumination of the scanning backlight unit 100 is increased, and if the depth (D) of the groove 138 is deeper than a preset depth, the illumination of the scanning backlight unit 100 does not change much. Therefore, the way of improving the illumination and the scanning efficiency of the scanning backlight unit 100 by adjusting the width (W) and the depth (D) of the groove 138 may be applied equally to the case of altering the thickness of the light guiding plate 130.
  • FIG. 8 schematically illustrates a scanning backlight unit 100a according to another embodiment.
  • the same reference numbers are given to the components which function equally as in the antecedent embodiment, so the detailed descriptions thereof are omitted.
  • the distribution density of the groove 138 formed at the bottom surface 136 of the light guiding plate 130 is changed from the antecedent embodiment.
  • the distribution density of the groove 138 increases as it distances from the first light source unit 100. That is, the distribution density of the groove 138 adjacent to the second side 131 b of the light guiding plate 130 is higher than the distribution density of the groove 138 adjacent to the first side 131a of the light guiding plate 130.
  • it is to embody a preset illumination along the length direction of the light guiding plate 130.
  • FIG. 9 schematically illustrates a television 200 which is adopted with the liquid crystal display 100 according to an exemplary embodiment.
  • This kind of the television 200 includes a signal receiving unit 210, a signal processing unit 220, a speaker 230, and the liquid crystal display 100.
  • the signal receiving unit 210 receives an external signal which includes image information or voice information.
  • the external signal may be a broadcasting signal sent from the broadcasting station or an output signal transmitted from peripheral devices such as a DVD player of a PC. Therefore, the signal receiving unit 210 may include an antenna and a tuner which receives the broadcasting signal and include a connector which receives the output signal transmitted from a DVD player or a PC etc.
  • the signal processing unit 220 conducts a signal process for the external signal received through the signal receiving unit 210 and generates an image signal to show images through the liquid crystal display 100 and a voice signal to output voice through the speaker 230.
  • the speaker 230 receives a voice signal which is generated by the signal processing unit 220 and outputs the voice.
  • the liquid crystal display 100 receives an image signal which is generated by the signal processing unit 220 and displays the same in visual.
  • the liquid crystal display 100 may control the motion blur and the crosstalk and thus may provide much clearer definition. Therefore, such the liquid crystal display 100 may be adopted to a three-dimensional television.
  • FIG. 9 illustrates that the liquid crystal display 100 is applied to the television 200, however, this is merely an example. It has to be understood that the liquid crystal display 100 according to the exemplary embodiment may be applied in various fields such as a computer monitor, an electric sign board, and a mobile equipment.
EP11187396A 2011-01-17 2011-11-01 Rückbeleuchtungsscanner und Flüssigkristallanzeigevorrichtung damit Withdrawn EP2476951A1 (de)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2808742A1 (de) * 2013-05-31 2014-12-03 Kyocera Document Solutions Inc. Lichtleiter und Beleuchtungsvorrichtung

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013104916A (ja) * 2011-11-10 2013-05-30 Sony Corp 表示装置および電子機器
CN102767763B (zh) * 2012-07-27 2014-06-25 深圳市华星光电技术有限公司 具有不均匀大小背光分区的侧入式背光模组及其设计方法
JP5532109B2 (ja) * 2012-11-15 2014-06-25 オムロン株式会社 導光板及び面光源装置

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11174439A (ja) * 1997-12-11 1999-07-02 Sanyo Electric Co Ltd 導光板、その導光板を用いた面光源、液晶表示装置及び導光板の製造方法
US20030174492A1 (en) * 2001-07-27 2003-09-18 Shingo Ohkawa Surface light device, image display device and light guide plate
US20050140847A1 (en) * 2003-12-24 2005-06-30 Jeon Seong M. Liquid crystal display device
WO2008045681A1 (en) * 2006-10-06 2008-04-17 3M Innovative Properties Company Backlight modules for autostereoscopic 3d display devices and scanning backlights for lcd devices
US20080259644A1 (en) * 2007-04-19 2008-10-23 Stanley Electric Co., Ltd. Surface illuminant equipment
US20080297695A1 (en) * 2007-05-31 2008-12-04 Hitachi Displays, Ltd. Liquid Crystal Display Device
US20090059621A1 (en) * 2007-08-27 2009-03-05 Hitachi Displays, Ltd. Liquid crystal display device
US20100142223A1 (en) * 2008-12-10 2010-06-10 James Rowland Suckling Backlight and display

Family Cites Families (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6633722B1 (en) * 1998-04-30 2003-10-14 Nippon Zeon Co., Ltd. Light guide plate with alicyclic resin
US7364341B2 (en) * 1999-02-23 2008-04-29 Solid State Opto Limited Light redirecting films including non-interlockable optical elements
US6888678B2 (en) * 2000-02-16 2005-05-03 Matsushita Electric Industrial Co., Ltd. Irregular-shape body, reflection sheet and reflection-type liquid crystal display element, and production method and production device therefor
KR100432438B1 (ko) * 2001-01-18 2004-05-22 주식회사 송산 빛을 회절 및 확산시키는 프리즘 디퓨저
WO2002061471A1 (fr) * 2001-01-31 2002-08-08 Zeon Corporation Plaque guide optique et unite d'eclairage
JP4130115B2 (ja) * 2002-10-16 2008-08-06 アルプス電気株式会社 照明装置、及び液晶表示装置
CN100437290C (zh) * 2003-10-18 2008-11-26 鸿富锦精密工业（深圳）有限公司 背光模组
CN100417989C (zh) * 2004-03-19 2008-09-10 友达光电股份有限公司 背光模块及其导光板
JP2005301016A (ja) * 2004-04-14 2005-10-27 Yowa:Kk 液晶表示装置バックライト用導光板
KR101286491B1 (ko) * 2006-07-10 2013-07-16 삼성디스플레이 주식회사 도광판과 이를 포함하는 액정표시장치
TWI350360B (en) * 2007-06-12 2011-10-11 Omron Tateisi Electronics Co Surface light source device
US8564730B2 (en) * 2007-07-06 2013-10-22 Lg Display Co., Ltd. Display device
JP5096941B2 (ja) * 2008-01-25 2012-12-12 セイコーインスツル株式会社 照明装置及びこれを用いた液晶表示装置
WO2009144992A1 (ja) * 2008-05-28 2009-12-03 シャープ株式会社 導光板、バックライト装置および液晶表示装置
TWI363199B (en) * 2008-10-30 2012-05-01 Au Optronics Corp Liquid crystal display and light quide plate thereof
KR101525839B1 (ko) * 2009-05-25 2015-06-08 삼성전자주식회사 백라이트 유닛 및 그를 구비한 액정표시장치
CN101718417B (zh) * 2009-11-11 2012-01-25 友达光电股份有限公司 液晶显示器及其导光板
JP4985788B2 (ja) * 2010-01-13 2012-07-25 オムロン株式会社 面光源装置及び液晶表示装置

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11174439A (ja) * 1997-12-11 1999-07-02 Sanyo Electric Co Ltd 導光板、その導光板を用いた面光源、液晶表示装置及び導光板の製造方法
US20030174492A1 (en) * 2001-07-27 2003-09-18 Shingo Ohkawa Surface light device, image display device and light guide plate
US20050140847A1 (en) * 2003-12-24 2005-06-30 Jeon Seong M. Liquid crystal display device
WO2008045681A1 (en) * 2006-10-06 2008-04-17 3M Innovative Properties Company Backlight modules for autostereoscopic 3d display devices and scanning backlights for lcd devices
US20080259644A1 (en) * 2007-04-19 2008-10-23 Stanley Electric Co., Ltd. Surface illuminant equipment
US20080297695A1 (en) * 2007-05-31 2008-12-04 Hitachi Displays, Ltd. Liquid Crystal Display Device
US20090059621A1 (en) * 2007-08-27 2009-03-05 Hitachi Displays, Ltd. Liquid crystal display device
US20100142223A1 (en) * 2008-12-10 2010-06-10 James Rowland Suckling Backlight and display

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2808742A1 (de) * 2013-05-31 2014-12-03 Kyocera Document Solutions Inc. Lichtleiter und Beleuchtungsvorrichtung
US9188734B2 (en) 2013-05-31 2015-11-17 Kyocera Document Solutions Inc. Light guide and illumination device

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US8692957B2 (en) 2014-04-08
CN102588824B (zh) 2016-08-10
US20120182500A1 (en) 2012-07-19
KR101866244B1 (ko) 2018-06-12
CN102588824A (zh) 2012-07-18
KR20120083047A (ko) 2012-07-25

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